I found this recent German study on the impact of tertiary Gleason Pattern 5 on risk of biochemical recurrence after RP. It addresses this risk by incorporating it into a quantitative model called Quantitative Gleason Grading. I don't know enough about
this new grading scheme to know exactly how much impact we are talking about
but it appears to be enough to worry about
. My guess is that the tertiary 5 bumps you up one risk category from favorable to unfavorable intermediate risk for your planning purposes. But I dunno.
Integrating Tertiary Gleason 5 Patterns into Quantitative Gleason Grading in Prostate Biopsies and Prostatectomy Specimens.The study's abstract said...
PATIENT SUMMARY:
Prostatectomy specimens (13 261) were analyzed to estimate the relevance of small Gleason 5 elements in prostate cancers. Even the smallest Gleason 5 areas markedly increased the risk of prostate-specific antigen recurrence after surgery. Larger fractions of Gleason 5 patterns had less further impact on prognosis. Based on this, a numerical Gleason score (integrated quantitative Gleason score) was defined by the percentages of Gleason 4 and 5 patterns, enabling a refined estimate of patient prognosis.